Internal-combustion engine



Patented Aug. 2.6, 1930 UNITED l STATES PATENT OFFICE EDWARD E. NEIzDNEn, or MILWAUKEE, WIscoNsIN f INTERNAL-coMBUsTIoN ENGINE Applcation'led January 16, 1928. Serial No. 246,996. y

simplify the problem ofV counterbalancing' and damping engine vibration.

The present invention may be utilized to particularadvantage 1n internal combustlon l engines ofthe two cycle type since the recti linear motion of the piston rods makes it possible to close the inner end of each cylinder to thus form a chamber for receiving, compressing and ultimately delivering the fuel charge to the combustion chamber.

Another object of the present vinvention is the provision in a two cycle internal combustion engine of means for equalizing the fuel charge within the cylinders.l

Other objects and advantages will appear from the following description of an illustrative embodimentof the present invention.

In the accompanying drawings Figure 1 is a sectional view of a two cycle internal combustion engine embodying the present invention.

Fig. 2 is a fragmentary sectional view taken along the line 2 2 of Figure 1.

The engine selected for illustration is of the two'cycle type and includes two pairs of aligned cylinders 10-10 and-11-11, rigidly attached to and radially disposed about a substantially7 rectangular cra'ik case, 12. Each cylinder includes the usual water jacketed head 13 having a spark plug receiving opening 14. The inner end of each cylinder is closed by a plate '15 whose edges are reduced, as indicated at llo, and firmly clamped between the end of the cylinder and the crank case. A piston 17,l workingin each cylinder, divides the interior thereof into a main. compression and combustion chamber 18 and a pre-compression chamber 19. Each piston is iiXed to the outer end of a piston rod 20 which extends through the pre-compressionI chamber 19 into the crank ca sev 12 and is closely reciprocation' in an fitted for lengthwise appropriate bearing sleeve 21 carried by the plate 15.

The pistonv rods 20 of each pair of aligned cylinders are rigidly iiXed at their inner ends to the opposite sides of a yoke 22, so that the pistons, rods,

and yoke of each pair of cylinders reciprocate as a unit. Each yoke is guided by and between a the crank case, and

movably xed in pair of rods23, re-

snugly engaged within grooves 24 formed in the ends of the yoke. A crank shaft 25 journaled in the crank case is provided with a single crank pin 26 Iotatabl slide blocks 27 c osely fitted for reciprocation within appropriate guideways 28 formed 1n the respective vokes 22 A combustible charge of fuel and air is admitted to each cylinde check controlled inlet 29 which communicates r through vthe usual engaged within a pair of with the pre-compression chamber 19 through a passage 30. Passage with aport 31 formed i 30 also communi ates n the wall of the main compression and combustion chamber 18; Communication between the passage 30 and the chambers 18 and v19 of each cylinder is controlled by the coacting pisto-n 17. In this instance each piston apron 32 having a port is provided with an 83 therein adapted to register with the lower end of passage 80, when the piston reaches the inner end of its stroke,

and to register with the port 31, when the piston reaches the outer end of its stroke.

As the pistonlapproaches the inner end of its stroke it also uncovers the port 31 to thereby `ber in each cylinder for receiving taneously .and uniformly vary of pairs of cylinchamber, a cham' 

